Antibacterial unsymmetrical diphenyl carbonates

ABSTRACT

Unsymmetrical diphenyl carbonates which contain as one alcohol moiety a phenoxyphenyl radical which is unsubstituted or substituted by halogen and/or lower alkyl or trifluoromethyl, and as a second alcohol moiety a phenyl radical which is unsubstituted or bears certain substituents, are disclosed as antibacterial agents.

lie-13 3a 5? if/l 9 6 2 United State [151 3,689,665 Traber et al. Sept. 5, 1972 [54] ANTIBACTERIAL UNSYMMETRICAL [56] References Cited DIPHENYL CARBONATES UNITED STATES PATENTS [72] Inventors: Walter Traber, Riehen; Anton G.

Weiss, Basel, h of Switzerland 3,134,802 5/1964 Gaertner et al ..424/30l X 3,506,720 4/1970 Model et a] ..260/463 X [73] Assignee: Clba-Gelgy Corporation, Ardsley,

N.Y. OTHER PUBLICATIONS [22] Filed: Jan. 14, 1971 Chemical Abstracts, Vol. 64, item 2010 c, 1966.

[21] Appl 106537 Primary ExaminerA lbert T. Meyers Related s Application Data Assistant Examiner-Doris J. Funderburk A t K 1F. [62] Division of Ser. No. 747,795,, July 26, 1968, Jrda F [52] US. Cl ..424/301, 106/ 15 R, 106/20, Unsymmetrical diphenyl carbonates which contain as 106/ 125, 106/ 164, 252/106, 252/107, one alcohol moiety a phenoxyphenyl radical which is 260/4995, 260/3985, 424/76 unsubstituted or substituted by halogen and/or lower [51] Int. Cl. ..A0ln 9/24 alkyl r triflu romethyl, and as a se nd al h l [58] Field of Search ..424/30l moiety a phenyl radical which is unsubstituted or bears certain substituents, are disclosed as antibacterial agents.

5 Claims, No Drawings ANTIBACTERIAL UNSYMMETRICAL DIPHENYL CARBONATES CROSS REFERENCE TO RELATED APPLICATION This is a division of application Ser. No. 747,795, filed July 26, 1968, now U.S. Pat. No. 3,634,484.

The present invention concerns new unsymmetrical diphenyl carbonates, processes for the production thereof, the use of these new esters as active substances for the disinfection of laundered goods and in antibacterial agents and preparations for combatting bacteria as well as the material treated with these carbonic acid esters.

l-lalogenated 2-hydroxy-diphenyl ethers, having antibacterial properties, are described in British Pat. No. 1,024,022 and esters of halogenated 2-hydroxy-diphenyl ethers with aliphatic dicarboxylic acids, also having antibacterial properties, are disclosed in Belgian Pat. No. 659,636. These types of compounds, however, are only insufficiently suitable for the disinfection and protection of laundered goods, since their bactericidal activity is completely lost when used in washing liquors containing chlorine.

The new unsymmetrical diphenyl carbonates correspond to the general formula I In this formula R and R independently of each other each represent hydrogen or a halogen atom of an atomic number of at most 35,

the benzene ring B is unsubstituted or is monoto trisubstituted by halogen of an atomic number of at most 35 or by lower alkyl, or monoor di-substituted by the trifluoromethyl group,

the benzene ring C is unsubstituted or is monoor polysubstituted by halogen of an atomic number of at most 35, or monoto tri-substituted by alkyl or alkoxy with one to nine carbon atoms, or monoor di-substituted by the trifluoromethyl group, or substituted by the phenyl or by a halogenated phenyl radical.

In the general formula I, by halogen of an atomic number of at most 35, particularly chlorine and bromine are to be understood; and as a halogenated phenyl radical of the benzene ring C one monoto trisubstituted by chlorine and/or bromine is meant. Lower alkyl substituents of the benzene ring B have one or two carbon atoms, i.e., they are the methyl or the ethyl radicals, whilst for the benzene ring C besides those-alkyl groups with one to nine carbon atoms, alkoxy radicals with preferably one to three carbon atoms, particularly the methoxy and ethoxy radical are meant.

The new carbonic acid diesters of general formula I have good bactericidal and bacteriostatic properties against gram positive and gram negative bacteria such as Staphylococcus spec., Staphylococcus aureus Smith, Staphylococcus lactis, also Bacillus mesentericus, Bacillus pumilus, Bacillus subtilis, Coli forms, Corynebacterium diphtheriae, Clostridium botulium, Clostridium butyricum, Clostridium welchii, (,lostridium tetani, Klebsiella pneumoniae, Alcaligenes faecalis, Sarcina spec., Salmonella pullorum, Salmonella typhi, Salmonella paratyphi A and B, Salmonella typhi murium, Salmonella enteritidis, Shigella dysenteriae, Shigellaflexneri, Brucella abortus, Proteus mirabilis, Achromobacter. spec., Serratia marcescens, Pasteurella pseudotuberculosis. In addition, they have low toxicity to warm blooded animals and have no irritant action at all on the skin and mucous membranes. Because of these good properties, the new esters can be used for the most various purposes, e.g., for the protection of organic materials and useful objects, particularly as ba tericidal additives to cleansing materials of all types such as sTSapsWiiZTde wherein R and R have the meanings given above and the benzene ring B has the definition given in formula I, with a chlorocarbonic acid ester of the general formula III or with its components, namely phosgene and a phenol of the general formula IV which are capable of forming in situ such a chlorocarbonic acid ester, in which formulas the benzene ring C can be substituted as given in formula I, the reaction preferably being performed in the presence of an acid binding agent;

or by reacting a hydroxydiphenyl ether of the general formula II with phosgene to give a 2-phenoxyphenyl chlorocarbonate of the general formula V (III) wherein R, and R and the benzene ring B have the meanings given in formula I, and by further reacting the chlorocarbonate of formula V with a phenol of formula IV, preferably in the presence of an acid-binding agent. The hydroxydiphenyl ethers of general formula II are known starting materials or they can be obtained by the process according to British Pat. No. 1,024,022. Chlorocarbonic acid derivatives of the general formulas III and V also belong to a known class of compounds which can be produced in the known way by reaction of a phenol with phosgene.

For the production of the new carbonic acid diesters of the general formula I, the following hydroxydiphenyl ethers of the general formula II, for example, can be used:

3 ',4-dichloro-2-hydroxy-diphenyl ether 3',4,4-trichloro2hydroxy-diphenyl ether 2',4-dichloro-2-hydroxy-diphenyl ether 2',4-dibromo-4-chloro-2-hydroxy-cliphenyl ether 4-chloro-2-hydroxy-diphenyl ether 4,4-dichloro-2hydroxy-diphenyl ether 4-chloro-4'-bromo-2-hydroxy-diphenyl ether 4-methyl4-chloro-2-hydroxy-diphenyl ether 4,4-dichloro-5-bromo-2hydroxy-diphenyl ether 4,2,4-trichloro-5-bromo-2-hydroxy-diphenyl ether 4,2 ,4-trichloro-2-hydroxy-diphenyl ether 4-bromo-4'-chloro2-hydroxy-diphenyl ether 2 ,4 ,5 ,4-tetrachloro-2hydroxy-diphenyl ether 4,2,4'-tribromo-2-hydroxy-diphenyl ether 4-bromo-2,4'-dichloro-2-hydroxy-diphenyl ether 4,4-dibromo-2-hydroxy-diphenyl ether 4'-chloro-2-hydroxy-diphenyl ether and 4,4-dichloro-3'-trifluoromethyI-Z-hydroxy-diphenyl ether.

2-Hydroxy-diphenyl ethers of formula II are preferred which are substituted by at least one and at most three halogen atoms or by one to two halogen atoms and/or lower alkyl radicals and/or trifluoromethyl radicals.

In the process according to the invention, organic bases such as tertiary amines, eg 7 pyridine, triethylamine, and inorganic bases such as the hydroxides and carbonates of alkali and alkaline earth metals are used as acid binding agents. Halogenated hydrocarbons, amides, ethers and either-type compounds are used as solvents or diluents in the process mentioned.

The production of some new carbonic acid diesters of the general formula I is described in the following examples. The temperatures are given in degrees Centigrade and parts are to be understood as parts by weight and are related to parts by volume as grams to milliliters.

Example 1 I 1 1.9 Parts of 2',4,4-trichloroQ-hydroxy-diphenyl ether and 3.24 parts of pyridine are dissolved in 27 parts by volume of methylene chloride. 10.75 Parts of Chlorocarbonic acid-(4-n-nonylphenyl)-ester dissolved in 10 parts by volume are then added dropwise to this solution at a temperature of 0 and 5, whereupon the reaction mixture is stirred for 2 hours at room tempera ture. The precipitate formed is filtered off and washed with methylene chloride. The methylene chloride filtrate is then washed several times with water and dried. After distilling off the methylene chloride, the 0-[2- (2 ,4 (I 5-chlorophenyl]'0-( 4'-n-nonylphenyl) carbonate is distilled: BI. 200-2l0/0.005 Torr.

Example 2 a. 210 Parts of phosgene are sparged at 5 to 10 into a solution of 435 parts of 4,2',4-trichloro-2-hydroxydiphenyl ether in 900 parts by volume of dry toluene. At 0 to 5, a solution of 166 parts of triethylamine in 300 parts by volume of dry toluene is then added dropwise. The reaction mixture is stirred for 4 hours at room temperature, and the excess phosgene is then removed by sparging dry nitrogen into the mixture. The precipitated amine hydrochloride is filtered off and the filtrate evaporated in vacuo. The residue is vacuumdistilled and 2-(2',4-dichlorophenoxy)-5-chlorophenyl chlorocarbonate is obtained, B.P. 160162/0.05 Torr.

b. Parts of 4-phenyl-phenol are dissolved in 300 parts by volume of methylene chloride, 39.5 parts of pyridine are added and the solution cooled to 10. At a temperature of 10-15, 176 parts of 2(2,4'- dichlorophenoxy)-5-chlorophenyl chlorocarbonate diluted with 200 parts by volume of methylene chloride are added dropwise. The reaction mixture is stirred at room temperature for two hours, filtered, and the filtrate washed with water and dried with magnesium sulfate. After evaporating the solvent the residue is recrystallized from isopropanol.

0-[2-(2",4"-Dichlorophenoxy)-5-chlorophenyl]-0- (4'-phenyl-phenyl) carbonate is thus obtained, M.lP. ll8-120.

The new carbonic acid diesters of general formula 1 given in the following Table are obtained in the way described in the above examples.

compounds boiling point/BF.

melting point/MP.

S-chlorophenyl }-0-( 2 '-phenyl-phenyl) carbonate 0-[ 2-( 2' ',4' '-dichlorophenoxy )-4-bromo- B.P. 200-220l 5-chlorophenyl]-0-(2'-phenyl-4-chloro- 0.001 Torr phenyl) carbonate O-[2-( 2",4 'dibromophenoxy)-5-chloro- B.P. l80200/ phenyl]-0-(4'-methoxyphenyl) carbonate 0.001 Torr pheny1]-0-( 2-phenyl-phenyl) carbonate 0 methyl-phenyl) carbonate O-[2-(2",4"-dibromophenoxy)-5-chloro- B.P. 200-220/ phenyl]-0-( 2'-chloro-4'-phenyl-phenyl) 0.001 Torr carbonate 0-[2-(2",4"-dichlorophenoxy)-5-bromo- B.P. 180/ phenyl]-O-(4'-methoxyphenyl) carbonate 0.001 Torr [2-(2",4"-dichlorophenoxy)-5-chloro- M.P. 155-157 phenyl]-(2',4'-di-ten.butyl-5'-n1ethylphenyl) carbonate 0-[2-(4"-bromophenoxy)-5-bromophenyl]- B.P. ZOO-220] 0-(2-phenyl-phenyl) carbonate 0.001 Torr 0-[2-(3"-trifluoromethyl-4"-chloro- B.P. 200"/ phenoxy)--chlorophenyl]0-(2'-phenyl- 0.001 Torr 4-chlorophenyl) carbonate phenyl ]carbonate 0-[ 2-( 2' ',4"-dichlorophenoxy )-5-chlorophenyl]-0-[ 2'-( 4' '-chlorophenyl )-4- chlorophenyl] carbonate 0-[ 2-( 2' ',4 -dichlorophenoxy)-5-chlorophenyl]-0-(3'-methy1-4'-chlorophenyl) carbonate 0-[ 2-( 2' ,4 '-dichlorophenoxy )-5-chlorophenyl]-0-( 2' ,4 5'-trichlorophenyl) carbonate 0-[ 2-( 2' ',4"-dichlorophenoxy )-5-chlorophenyl]-0-(pentachlorophenyl) carbonate The carbonic acid diesters of general formula I have an excellent growth-inhibiting action in various series of tests, such as the incorporation test (testing of the growth of bacteria or fungi on culture medium into which various concentrations of the active substances have been incorporated) described by X. Buhlmann, WA. Vischer and H. Bruhin [Zbl. Bakt. Abteilung I, Originale, 180 327-334 (1960)], and the diffusion test (measurement of the breadth of zones of inhibition) described by H. Bruhin and Buhlmann [Path Microbiol. 26, 108-123 (1963)], against gram positive and gram negative bacteria such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Salmonella typhi.

Bacteriostatic activity in vitro (diffusion test) The test substance is dissolved in a suitable solvent in a concentration of 5000 'y/ccm.

Sterile strips of filter paper (5 X 85 mm, liquid takeup of each strip about 0.1 ccm) are dipped in the solution of test substance and then hung up to dry. Each strip is then placed in a petri dish (85 mm inner diameter, filled with ccm culture medium) and the dishes, containing uninoculated medium, are placed for 16 hours in an incubation chamber to allow the test substances to penetrate into the media. Only then is a strip of the medium inocluated with the bacteria for the test, after which they are bred for 24 hours at 37C.

As result, the size of the zone of inhibition, including the width of the filter paper strip, is given in mm.

bacteria Klebs. Salm. coli pneu. NCTC NCTC 86 7242 Staph. aureus NCTC 7447 active substance Esch.

typhi NCTC 8384 The solution of active substance is added to the still liquid agar culture and the mixture is poured into petri 'dishes so that each contains 20 ccm. After it has solidified, the culture medium is inoculated with suitable suspensions of bacteria.

The media are then placed in an incubation chamber for 24 hours at 37C. The test is evaluated by determining the lowest concentration at which growth of the bacteria is completely inhibited.

The figures given in the following Table are the minimal concentration which inhibits growth. They are shown in ppm (parts of active substance per 10 parts of diluent), which corresponds to an amount of l 'yper ccm.

bacteria Klebs. Salm. pneu. typhi NCTC NCTC 7242 8 3 84 active substance Esch.

coli NCTC Staph. aureus NCTC 7447 0-[2-(2,4"-dichlorophenoxy)-5- chlorophenyl1-0- (4'-n-octylphenyl) carbonate O-[2-(2",4"-dichlorophenoxy)-5- chlorophenyl]-0- (4'-tert.octylphenyl) carbonate 0-[2-(4"-chlorophenoxy)-5-chlorophenyl]-0-(4'-tert. l octylphenyl) carbonate 0-[2-(2",4"-dichlorophenoxy)-5- chlorophenyl]-0- (4'-n-nonylphenyl) carbonate The following tests were made to determine the bacteriostatic activity in washing liquors containing chlorine:

The active substance, previously dissolved ina ratio of 1:100 in dimethyl formamide, is added in the concentrations given to a washing liquor containing 2.5 g/litre soap and 2 ccm/litre of an aqueous sodium hypochlorite solution containing 15 percent active chlorine (B). Cotton fabric is introduced into this liquor (liquor ratio 1:20 20) and the liquor is heated to 90 C. The textile is treated for 20 minutes at this temperature, then rinsed twice for 3 minutes at 40 C with permutit-water (liquor ratio 1:20 wrung out and dried. Circular samples (20 mm diameter) are cut from this washed and treated textile and laid on agar plates which have been inoculated previously with 24 hour old cultures of Staphylococcus aureus SG 511 or Escherichia coli 96. The agar plates are then put into an incubating chamber for 24 hours at 37 C. The values summarized in the following Table give the extent to the zones of inhibition around the sample in mm; the sign means no formation of colonies and the sign means formation of colonies under the sample.

Staph. concenaureus E. coli compounds tration A B A B in ppm O-[2-(4"-chl0rophenoxy)-5 chlorophenyl]-O-(4'-n-octyl- 100 lO 10l0 8 phenyl) carbonate 200 ll0% l 10- O-[2-(2",4"-dichl0r0phen0xy)- -chlorophenyl]-0-(4'-n- 100 S- l 2- 0- octylphenyl) carbonate 200 7- 4 2 l- 0[2-(4"-chlorophenoxy)-5- chlor0phenyl]-0-(4'-tert. 100 8 4- 9 5 octylphcnyl) carbonate 200 9 6- l0- 6 O-[2-(2",4"-dichlor0phen0xy)-5 -chlorophenyl]O-(4'-tert. 100 8- 6- 5 4 octylphenyl) carbonate 200 8- 7- 5 5- 0-[2-(2",4"-dichlorophenoxy)-5 -chlorophenyl]-0-(4'-n- 100 7- 4- 5- 2- nonylphenyl) carbonate 200 7- 6- 5 5- 0-[2-(2",4"-dichlorophenoxy)-5 -chlorophenyl]- 0-(4'- 100 12- 9 6- 3 methoxyphenyl) carbonate 200 l4- l46- 5- 2-hydroxy-4,4'-dichlorophenyl 100 13- 0+ l3 0+ ether 200 l4- 0+ l4- 0+ 2-hydroXy-4,2',4'-trichloro- 100 l2- 0+ 9 0+ ether* 200 l3 0+ 9 0+ di-[2-(4'-chlorophenoxy)5- 100 ll- 0+ l2 0+ chlorophenyl] oxalate* 200 l3 0+ 12- 0+ di-[2(2',4'dichlorophenoxy)- 100 10- 0+ 9- 0+ Schlorophenyl] oxalate* 200 12-- 0+ lO- 0+ compounds known from British Patent No. l,024,022 and Belgian Patent No. 659,636

This stability of action of the carbonic acid diesters according to the invention is maintained not only in Washing liquors containing hypochlorite but also generally in all washing or rinsing liquors which contain active chlorine.

As wash-active substances, washing or rinsing liquors can contain, e.g., anion active compounds such as aromatic sulphonic acids substituted by lipophilic groups or their water soluble salts such as the sodium salt of dodecylbenzene sulphonic acid, or water soluble salts of sulphuric acid monoesters of higher molecular alcohols or their polyglycol ethers, e.g. soluble salts of dodecyl alcohol sulphate, or of dodecyl alcohol polyglycol either sulphate, or alkali metal salts of higher fatty acids (soaps), also non-ionic wash-active substances such as polyglycol ethers of higher fatty alcohols, also polyglycol ethers of higher molecular alkylated phenols as well as so-called amphoteric washactive substances, e.g., reaction products of the alkali metal salts of low halogen fatty acids with polyalkylene polyamines containing lipophilic radicals such as with lauryl diethylenetriamine. In addition, the liquor can also contain the usual auxiliaries such as water soluble perborates, polyphosphates, carbonates, silicates, optical brighteners, plasticizers, salts having an acid reaction such as ammonium or zinc silicofiuoride, or certain organic acids such as oxalic acid, also finishers, e.g. those based on synthetic resins, or starch.

Primarily organic fiber material chiefly that of natural origin such as that containing cellulose, e.g., cotton, or containing polypeptide, e.g., wool or silk, or fiber Tish material of synthetic origin such as that based on polyamide, polyacrylonitrile or polyester, or mixtures of the fibers mentioned above, can be sterilized with such washing or rinsing liquors containing active substance.

in concentrations of about 1-200 ppm (parts of active substance per 10 diluent), the carbonic acid diesters usable according to the invention lend both to the liquor as well as to the articles washed therewith substantial and long-lasting freedom from germs of the Staphylococci and Coli forms, and this is maintained even after exposure of the active substance or of the goods treated therewith. They differ from previously known compounds by their stability to light on the goods laundered therewith and by their great activity and breadth of action against gram positive and gram negative micro-organisms.

The new carbonic acid esters are also effective against bacteria which cause perspiration odors so that they are suitable as deodorants for personal linen and for incorporation into cleaning agents such as soaps or shampoos, or as additives to other cosmetics.

In addition, the carbonic acid diesters can be incorporated direct into the material to be protected, e.g., into material having a synthetic resin basis such as polyamides and polyvinyl chloride, into paper treatment liquors, into printing thickeners made of starch or cellulose derivatives, igto lacquers andpaints yvhich contain, e.g., casein, into cellulose, into visc'ose spinning masses, pififer, animal glues or oils, into permanent sizes based on polyvinyl alcohol. In addition they can also be added to preparations of inorganic or organic pigmegtsfor the painting and decorating industry, plasticizers etc. v V i The carbonic acid diesters of formula I can further be used in the form of their organic solutions, e.g., as sprays, in dry cleaning additives, or for the impregnation of wood. For this purpose, organic solvents, preferably non-water miscible solvents, particularly petroleum fractions, also however, water miscible solvents such as low alcohols, e.g., methanol or ethanol or ethylene glycol monomethyl or monoethyl ether, can be used. The carbonic acid diesters of formula I can be used in the form of their aqueous dispersions together with wetting or dispersing agents, e.g., for the protection of substances which tend to rot, e.g., leather, paper etc.

Solutions or dispersions of active substance which can be used for the protection of these materials should have a content of active substance of at least 0.001 g/litre.

In all these forms the newcarbonic acid diesters of general formula I can be the sole active substances or they can be combined with other known antimicrobial, particularly anti-bacterial and/or antimycotic active substances. They can be combined with, e.g. halogenated and/or halogenoalkyl-substituted salicylic acid alkylamides and alkyl anilides, halogenated and/or halogenoalkyl-substituted diphenyl ureas, optionally halogenated benzoxazolones, polychlorohydroxydiphenyl methanes, halogen-hydroxy-diphenyl sulphides, halogenated hydroxydiphenyl ethers, bactericidal 2-imino-imidazolidines or bactericidal quaternary compounds, dithiocarbamic acid derivatives or with tetramethyl thiuram disulphide. A broadening of the range of action and/or synergism occurs in some of the combinations mentioned of the carbonic acid diesters usable according to the invention with other antimicrobial active substances.

Example 3 To a detergent composition liquefiable at high temperatures and composed of 40 parts of sodium soap based on lauric, myristic and palmitic acid,

30 parts of sodium tripolyphosphate,

5 parts of tetrasodium pyrophosphate,

4 parts of sodium silicate,

3 parts of magnesium silicate,

0.5 part of tetrasodium salt of ethylene diamine tetraacetic acid,

5 parts of sodium carbonate,

5.5 parts of sodium sulfate and 70 parts of water,

there are added at 85 to 90 0.2 part of l-(3'-chlorophenyl)-3-(4"-chloro-phenyl)-pyrazoline (optical brightener), and

1.0 part of -[2-(2",4"5-chlorophenyl]-0-( 4'-n-octylphenyl) carbonate.

The components are thoroughly mixed and then dried in the spray tower. A spreadable bactericidal detergent is obtained. Example 4 200 parts of soap powder, consisting of 88.0 percent mixture of the sodium salt of tallow fatty acid and sodium salt of coconut oil fatty acid (weight ratio 70:30

2.0 percent almond oil,

1.0 percent perfume,

0.2 percent titanium dioxide,

0.5 percent glycerol,

0.05 percent tetrasodium salt of ethylene diamine tetraacetic acid,

0.05 percent l-(3'-chlorophenyl)-3-(4"- chlorophenyl)-pyrazoline (optical brightener),

2.0 percent 0-[2-(2",4"5-

chlorophenyl]-0-(4'-methoxyphenyl) carbonate, and

6.2 percent water, together with 400 parts of water are worked at 80 into a homogeneous mass and then dried at 70 to 80 in vacuo. A brightened bactericidal soap material is obtained which can be formed into pieces or ground into a powder.

Example 992 parts of a heavy-duty non-soap synthetic detergent consisting of 152 parts of dodecyl benzene sulfonate,

38 parts of sodium salt of lauryl alcohol sulfonic acid ester,

256 parts of sodium tripolyphosphate,

76 parts of tetrasodium pyrophosphate,

40 parts of sodium silicate,

19 parts of magnesium silicate,

50 parts of sodium carbonate,

14 parts of carboxymethylcellulose,

3 parts of tetrasodium salt of ethylene diamine tetraacetic acid, and

344 parts of sodium sulfate are mixed with 1000 parts of water to form a homogeneous slurry. To this mixture are added 1 part of 4,4'-bis[4",6"-diphenyl-amino-l",3",5"-triazinyl- (2")-amino]-stilbene-2,2'-disulfonic acid (optical brightener) and parts of 0-[2-(4"-chlorophen-oxy)- 10 bonate of the formula wherein each of R and R represents hydrogen or halogen of an atomic number of at most 35,

the benzene ring B is unsubstituted; or monoto trisubstituted by members selected from the group consisting of halogen of an atomic number of at most 35, lower alkyl, and trifluoromethyl; with the proviso that ring B may have no more than two trifluoromethyls attached thereto, and

the benzene ring C is unsubstituted; monoto pentasubstituted by halogen of an atomic number of at most 35', or monoto tri-substituted by members selected from the group consisting of halogen of an atomic number of at most 35, alkyl having from one to nine carbon atoms, alkoxy having from one to nine carbon atoms, trifluoromethyl, phenyl, and halogenated phenyl; with the proviso that ring C may have no more than two trifluoromethyls, no more than one phenyl and no more than one halogenated phenyl attached thereto,

and (2) a carrier compatible with said diphenyl carbonate compound.

2. A method for combatting bacteria and for protection of organic materials and manufactured articles 45 susceptible to attack by bacteria, which method comprises applying thereto a bactericidally effective amount of a diphenyl carbonate of the formula selected from the group consisting of halogen of an atomic number of at most 35, alkyl having from one to nine carbon atoms, alkoxy having from one to nine carbon atoms, trifluoromethyl, phenyl, and halogenated phenyl; with the proviso that ring C may have no more than two trifluoromethyls, no more than one phenyl and no more than one halogenated phenyl attached thereto.

3. A method as defined in claim 2 in which the l (5W9) PJI'H. I. my 1? iii 34. B115 rm mm A U 51 ffibifs It. is -crt:i..ft';icad that error appears in the abm;e-ddeutified Uiliifilflt and. that said Letters Patent are hereby correcteu as s'hozm below:

[30] FOREIGN APPLICATION PRIORITY DATE Au ust 11, 1967 Switzerland 10855/67 Signed and sealed this 27th day of November 1973.

(SEAL) EDWARD I RFLETCHERJRQ RE D. V TEQTI-EER I h Attestihg Offiiir Acting COTfimISSlO'iIGT of Patents 

2. A method for combatting bacteria and for protection of organic materials and manufactured articles susceptible to attack by bacteria, which method comprises applying thereto a bactericidally effective amount of a diphenyl carbonate of the formula
 3. A method as defined in claim 2 in which the diphenyl carbonate is O-(2-(4''''-chlorophenoxy)-5-chlorophenyl)-O-4''-n-nonylphenyl)carbonate.
 4. A method as defined in claim 3 in which the diphenyl carbonate is O-(2-(2'''',4''''-dichlorophenoxy)-5-chlorophenyl)-O-(4''-n-octylphenyl) carbonate.
 5. A method as defined in claim 2 in which the diphenyl carbonate is O-(2-(2'''',4''''-dichlorophenoxy)-5-chlorophenyl)-O-(4''-methoxyphenyl) carbonate. 